Loans Receivable and Allowance for Credit Losses (Summary of Recorded Investment by Internal Risk Rating Systems) (Details) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 1,815,138,000	$ 1,714,082,000
Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	145,226,000	171,467,000
Total Loans, Fiscal Year Before Latest Fiscal Year	151,972,000	114,199,000
Total Loans, Two Years Before Latest Fiscal Year	101,436,000	167,819,000
Total Loans, Three Years Before Latest Fiscal Year	155,889,000	133,394,000
Total Loans, Four Years Before Latest Fiscal Year	112,928,000	81,861,000
Total Loans, Prior	310,853,000	277,003,000
Revolving Loans Amortized Cost Basis	69,629,000	76,688,000
Total	1,047,933,000	1,022,431,000
Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	145,037,000	171,327,000
Total Loans, Fiscal Year Before Latest Fiscal Year	150,602,000	113,922,000
Total Loans, Two Years Before Latest Fiscal Year	101,177,000	167,103,000
Total Loans, Three Years Before Latest Fiscal Year	155,327,000	130,222,000
Total Loans, Four Years Before Latest Fiscal Year	107,858,000	80,456,000
Total Loans, Prior	299,058,000	265,868,000
Revolving Loans Amortized Cost Basis	65,933,000	73,768,000
Total	1,024,992,000	1,002,666,000
Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	189,000	5,000
Total Loans, Fiscal Year Before Latest Fiscal Year	1,235,000
Total Loans, Two Years Before Latest Fiscal Year		287,000
Total Loans, Three Years Before Latest Fiscal Year	228,000
Total Loans, Four Years Before Latest Fiscal Year	2,036,000
Total Loans, Prior	3,570,000	3,154,000
Revolving Loans Amortized Cost Basis	814,000	164,000
Total	8,072,000	3,610,000
Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year		135,000
Total Loans, Fiscal Year Before Latest Fiscal Year	135,000	277,000
Total Loans, Two Years Before Latest Fiscal Year	259,000	429,000
Total Loans, Three Years Before Latest Fiscal Year	334,000	3,172,000
Total Loans, Four Years Before Latest Fiscal Year	3,034,000	1,405,000
Total Loans, Prior	8,225,000	7,981,000
Revolving Loans Amortized Cost Basis	2,882,000	2,756,000
Total	14,869,000	16,155,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	737,533,000	716,875,000
Commercial Real Estate Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	87,169,000	102,913,000
Total Loans, Fiscal Year Before Latest Fiscal Year	99,816,000	74,242,000
Total Loans, Two Years Before Latest Fiscal Year	69,980,000	122,143,000
Total Loans, Three Years Before Latest Fiscal Year	116,321,000	107,181,000
Total Loans, Four Years Before Latest Fiscal Year	92,705,000	62,346,000
Total Loans, Prior	252,397,000	226,821,000
Revolving Loans Amortized Cost Basis	19,145,000	21,229,000
Total	737,533,000	716,875,000
Current period gross charge-offs, Prior	62,000
Current period gross charge-offs, Total	62,000
Commercial Real Estate Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	87,169,000	102,773,000
Total Loans, Fiscal Year Before Latest Fiscal Year	99,681,000	74,242,000
Total Loans, Two Years Before Latest Fiscal Year	69,980,000	121,881,000
Total Loans, Three Years Before Latest Fiscal Year	116,116,000	104,720,000
Total Loans, Four Years Before Latest Fiscal Year	88,223,000	60,941,000
Total Loans, Prior	243,881,000	217,435,000
Revolving Loans Amortized Cost Basis	18,745,000	20,829,000
Total	723,795,000	702,821,000
Commercial Real Estate Loans [Member] \| Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year		5,000
Total Loans, Two Years Before Latest Fiscal Year		262,000
Total Loans, Three Years Before Latest Fiscal Year	205,000
Total Loans, Four Years Before Latest Fiscal Year	2,036,000
Total Loans, Prior	1,089,000	2,148,000
Total	3,330,000	2,415,000
Commercial Real Estate Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year		135,000
Total Loans, Fiscal Year Before Latest Fiscal Year	135,000
Total Loans, Three Years Before Latest Fiscal Year		2,461,000
Total Loans, Four Years Before Latest Fiscal Year	2,446,000	1,405,000
Total Loans, Prior	7,427,000	7,238,000
Revolving Loans Amortized Cost Basis	400,000	400,000
Total	10,408,000	11,639,000
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	60,680,000	63,488,000
Agricultural Real Estate Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	3,138,000	6,257,000
Total Loans, Fiscal Year Before Latest Fiscal Year	6,005,000	3,756,000
Total Loans, Two Years Before Latest Fiscal Year	3,470,000	12,036,000
Total Loans, Three Years Before Latest Fiscal Year	10,904,000	3,960,000
Total Loans, Four Years Before Latest Fiscal Year	3,736,000	7,148,000
Total Loans, Prior	33,075,000	29,811,000
Revolving Loans Amortized Cost Basis	352,000	520,000
Total	60,680,000	63,488,000
Agricultural Real Estate Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	2,984,000	6,257,000
Total Loans, Fiscal Year Before Latest Fiscal Year	5,140,000	3,756,000
Total Loans, Two Years Before Latest Fiscal Year	3,470,000	12,036,000
Total Loans, Three Years Before Latest Fiscal Year	10,904,000	3,960,000
Total Loans, Four Years Before Latest Fiscal Year	3,736,000	7,148,000
Total Loans, Prior	31,936,000	29,038,000
Revolving Loans Amortized Cost Basis	345,000	336,000
Total	58,515,000	62,531,000
Agricultural Real Estate Loans [Member] \| Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	154,000
Total Loans, Fiscal Year Before Latest Fiscal Year	865,000
Total Loans, Prior	1,139,000	773,000
Revolving Loans Amortized Cost Basis		150,000
Total	2,158,000	923,000
Agricultural Real Estate Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving Loans Amortized Cost Basis	7,000	34,000
Total	7,000	34,000
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	223,460,000	211,991,000
Commercial Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	52,630,000	57,939,000
Total Loans, Fiscal Year Before Latest Fiscal Year	42,889,000	34,365,000
Total Loans, Two Years Before Latest Fiscal Year	26,552,000	29,919,000
Total Loans, Three Years Before Latest Fiscal Year	26,104,000	19,874,000
Total Loans, Four Years Before Latest Fiscal Year	14,336,000	10,233,000
Total Loans, Prior	20,363,000	15,891,000
Revolving Loans Amortized Cost Basis	40,586,000	43,770,000
Total	223,460,000	211,991,000
Current period gross charge-offs, Fiscal Year Before Latest Fiscal Year		11,000
Current period gross charge-offs, Three Years Before Latest Fiscal Year	60,000
Current period gross charge-offs, Four Years Before Latest Fiscal Year	23,000	8,000
Current period gross charge-offs, Prior		51,000
Current period gross charge-offs, Revolving loans amortized cost basis		30,000
Current period gross charge-offs, Total	83,000	100,000
Commercial Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	52,595,000	57,939,000
Total Loans, Fiscal Year Before Latest Fiscal Year	42,889,000	34,088,000
Total Loans, Two Years Before Latest Fiscal Year	26,293,000	29,465,000
Total Loans, Three Years Before Latest Fiscal Year	25,747,000	19,163,000
Total Loans, Four Years Before Latest Fiscal Year	13,748,000	10,233,000
Total Loans, Prior	19,565,000	15,042,000
Revolving Loans Amortized Cost Basis	39,572,000	42,906,000
Total	220,409,000	208,836,000
Commercial Loans [Member] \| Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	35,000
Total Loans, Two Years Before Latest Fiscal Year		25,000
Total Loans, Three Years Before Latest Fiscal Year	23,000
Total Loans, Prior		106,000
Revolving Loans Amortized Cost Basis	14,000	14,000
Total	72,000	145,000
Commercial Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Fiscal Year Before Latest Fiscal Year		277,000
Total Loans, Two Years Before Latest Fiscal Year	259,000	429,000
Total Loans, Three Years Before Latest Fiscal Year	334,000	711,000
Total Loans, Four Years Before Latest Fiscal Year	588,000
Total Loans, Prior	798,000	743,000
Revolving Loans Amortized Cost Basis	1,000,000	850,000
Total	2,979,000	3,010,000
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	26,260,000	30,077,000
Other Agricultural Loans [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	2,289,000	4,358,000
Total Loans, Fiscal Year Before Latest Fiscal Year	3,262,000	1,836,000
Total Loans, Two Years Before Latest Fiscal Year	1,434,000	3,721,000
Total Loans, Three Years Before Latest Fiscal Year	2,560,000	2,379,000
Total Loans, Four Years Before Latest Fiscal Year	2,151,000	2,134,000
Total Loans, Prior	5,018,000	4,480,000
Revolving Loans Amortized Cost Basis	9,546,000	11,169,000
Total	26,260,000	30,077,000
Current period gross charge-offs, Prior	48,000
Current period gross charge-offs, Total	48,000
Other Agricultural Loans [Member] \| Pass [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Current Fiscal Year	2,289,000	4,358,000
Total Loans, Fiscal Year Before Latest Fiscal Year	2,892,000	1,836,000
Total Loans, Two Years Before Latest Fiscal Year	1,434,000	3,721,000
Total Loans, Three Years Before Latest Fiscal Year	2,560,000	2,379,000
Total Loans, Four Years Before Latest Fiscal Year	2,151,000	2,134,000
Total Loans, Prior	3,676,000	4,353,000
Revolving Loans Amortized Cost Basis	7,271,000	9,697,000
Total	22,273,000	28,478,000
Other Agricultural Loans [Member] \| Special Mention [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans, Fiscal Year Before Latest Fiscal Year	370,000
Total Loans, Prior	1,342,000	127,000
Revolving Loans Amortized Cost Basis	800,000
Total	2,512,000	127,000
Other Agricultural Loans [Member] \| Substandard [Member] \| Non-Homogenous Pools [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving Loans Amortized Cost Basis	1,475,000	1,472,000
Total	$ 1,475,000	$ 1,472,000

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